Description
Primordial features are specific model-dependent corrections on top of
the standard power-law inflationary power spectrum, where different functional
forms come from different inflationary scenarios. Signature of any significant
departure from the feature-less power spectrum will enable us to decipher the
intricacies of the inflationary Universe. Here, we delve into three major yet distinct
features, namely, Bump feature, Sharp feature signal, and Resonance feature
signal. To analyse the features, we adopt a specific template for each feature
model. We estimate the possible constraints on the feature parameters by
employing Fisher matrix forecast analysis for the upcoming CMB missions such as
CMB-S4, CORE-M5, LiteBIRD, PICO conjointly with DESI, and EUCLID galaxy
surveys and upcoming SKA surveys (wherein we explore SKA-Cosmic Shear and
SKA-Intensity Mapping surveys). Furthermore, the significance of combining
EUCLID-Galaxy surveys with the SKA-Intensity Mapping survey is also explored. A
comparative analysis of all three features has been done to estimate relative
capabilities of these upcoming observations in shedding light on this crucial aspect
of precision cosmology. This analysis will help us to understand quantitatively the
competence of forthcoming cosmological surveys in detecting primordial features
in the primordial power spectrum.
